Display Device with a Reduced Dead Space

1. A display device comprising: a display area and a non-display area positioned around the display area, the non-display area comprising a pad portion and a contact portion that is disposed between the display area and the pad portion, a first circuit portion comprising a demultiplexer disposed in the display area, a first connection electrode disposed in the pad portion, and a second connection electrode disposed in the contact portion; and a second circuit portion disposed on a layer different from the first circuit portion and comprising a pixel disposed in the display area, a pad disposed in the pad portion, and a data line extending across the contact portion and the display area and electrically connected to the pixel, wherein the pad is electrically connected to the demultiplexer through the first connection electrode, and wherein the data line is electrically connected to the demultiplexer via the second connection electrode.

2. The display device of claim 1 , further comprising: a first fan-out line connecting the first connection electrode and the demultiplexer; and a second fan-out line connecting the demultiplexer and the second connection electrode, wherein the first fan-out line extends across the pad portion, the contact portion, and the display area, and the second fan-out line extends across the display area and the contact portion.

3. The display device of claim 2 , wherein the first connection electrode and the second connection electrode are disposed on a first same layer and comprise a first same material, and wherein the pad and the data line are disposed on a second same layer and comprise a second same material.

4. The display device of claim 3 , wherein the first fan-out line and the second fan-out line are disposed on a same layer and comprise a same material, and wherein the same layer on which the first fan-out line and the second fan-out line are disposed is different from another layer on which the first connection electrode is disposed.

5. The display device of claim 4 , wherein the pixel comprises a pixel transistor and a light-emitting element electrically connected to the pixel transistor, and wherein the demultiplexer comprises a demultiplexer transistor.

6. The display device of claim 5 , wherein the pixel transistor comprises a pixel semiconductor layer, and the demultiplexer transistor comprises a demultiplexer semiconductor layer, and wherein the pixel semiconductor layer and the embedded circuit semiconductor layer comprise different materials.

7. The display device of claim 6 , wherein one of the demultiplexer semiconductor layer and the pixel semiconductor layer comprises an oxide semiconductor, and the other of the demultiplexer semiconductor layer and the pixel semiconductor layer comprises a polysilicon.

8. The display device of claim 5 , wherein the pixel transistor comprises a pixel semiconductor layer, a pixel gate electrode disposed on the pixel semiconductor layer, and a pixel source electrode and a pixel drain electrode disposed on the pixel gate electrode, and wherein the pixel source electrode and the pixel drain electrode are electrically connected to the pixel semiconductor layer, and the pixel source electrode and the pixel drain electrode are disposed on a same layer as the pad.

9. The display device of claim 8 , wherein the demultiplexer transistor comprises a demultiplexer semiconductor layer, a demultiplexer gate electrode disposed on the demultiplexer semiconductor layer, and a demultiplexer source electrode and a demultiplexer drain electrode disposed on the demultiplexer gate electrode, and wherein the demultiplexer source electrode and the demultiplexer drain electrode are disposed on a same layer as the first connection electrode.

10. The display device of claim 1 , wherein the second connection electrode is closer to the display area than the first connection electrode when viewed from top in a plan view.

11. The display device of claim 1 , further comprising: an interlayer dielectric layer disposed between the first circuit portion and the second circuit portion.

12. The display device of claim 11 , wherein the interlayer dielectric layer is in direct contact with the first connection electrode and the second connection electrode.

13. A display device comprising: a display area and a non-display area positioned around the display area, the non-display area comprising a pad portion and a contact portion that is disposed between the display area and the pad portion, a first circuit portion comprising a demultiplexer disposed in the display area, a first connection electrode disposed in the pad portion, and a second connection electrode disposed in the contact portion; and a second circuit portion disposed on a layer different from the first circuit portion and comprising a pixel disposed in the display area, a pad disposed in the pad portion, and at least one data line extending across the contact portion and the display area and electrically connected to the pixel, wherein the pad is electrically connected to the demultiplexer through the first connection electrode and provides a data signal to the demultiplexer, wherein the at least one data line is electrically connected to the demultiplexer via the second connection electrode, and wherein the demultiplexer generates divided data signals by dividing the data signal received from the pad using a time-division multiplexing.

14. The display device of claim 13 , wherein the at least one data line comprises a first data line and a second data line that provide the divided data signals, respectively.

15. The display device of claim 14 , wherein the second connection electrode comprises a first electrode portion connecting the demultiplexer and the first data line, and a second electrode portion connecting the demultiplexer and the second data line.

16. The display device of claim 15 , further comprising: a first fan-out line connecting the first connection electrode and the demultiplexer; and a second fan-out line connecting the demultiplexer and the second connection electrode, wherein the first fan-out line extends across the pad portion, the contact portion, and the display area, and the second fan-out line extends across the display area and the contact portion.

17. The display device of claim 16 , wherein the second fan-out line comprises a first line portion connecting the demultiplexer and the first electrode portion, and a second line portion connecting the demultiplexer and the second electrode portion.

18. The display device of claim 13 , wherein the at least one data line extends in a first direction, and wherein the first circuit portion comprises a plurality of demultiplexers arranged along a second direction crossing the first direction.

19. The display device of claim 18 , wherein same demux select signal lines are connected to the plurality of demultiplexers.

20. The display device of claim 13 , wherein the at least one data line extends in a first direction and comprises a plurality of data lines arranged along a second direction crossing the first direction, wherein the first circuit portion comprises a plurality of demultiplexers comprising a first demultiplexer and a second demultiplexer, and wherein the first demultiplexer and the second demultiplexer are connected to different data lines of the at least one data line.

21. The display device of claim 20 , wherein the first demultiplexer and the second demultiplexer are connected to different demux select signal lines.

22. The display device of claim 1 , wherein the pixel overlaps the demultiplexer.